<?php
//list of dimension units
$dimension_units = array("C" => "Centimeter", "F" => "Foot", "I" => "Inch", "M" => "Millimeter");
//list of volume units
$volume_units = array("CUF" => "Cubic Foot", "CUI" => "Cubic Inch", "GUK" => "UK Gallon", "GUS" => "US Gallon", "LIT" => "Liter", "MIL" => "Milliliter");
//volume converter from cu. cm
$vol_conv_cucm = array("CUF" => 0.00003531466672, "CUI" => 0.0610237441, "GUK" => 0.000219969157, "GUS" => 0.000264172052, "LIT" => 0.001, "MIL" => 1);
//volume converter from cu. ft
$vol_conv_cuft = array("CUF" => 1, "CUI" => 1728, "GUK" => 6.22883288, "GUS" => 7.48051948, "LIT" => 28.3168466, "MIL" => 28316.8466);
//volume converter from cu. in
$vol_conv_cuin = array("CUF" => 0.000578703704, "CUI" => 1, "GUK" => 0.00360464866, "GUS" => 0.00432900433, "LIT" => 0.016387064, "MIL" => 16.387064);
//volume converter from cu. mm
$vol_conv_cumm = array("CUF" => 0.0000000353146667, "CUI" => 0.0000610237441, "GUK" => 0.000000219969157, "GUS" => 0.000000264172052, "LIT" => 0.000001, "MIL" => 0.001);
//list of concentrations
$concentration_units = array ("P" => "PPM", "M" => "mg/L", "D" => "Degree");
//list of weights
$kg2lb = 2.20462262;
$substrate_densities = array ("Carib Sea Eco Complete" => 2.976488, "Seachem Flourite" => 0.961008, "Laterite" => 1.018525, "Pea Gravel" => 1.78781, "Regular Gravel" => 1.345651)
//
?>